Folding box



July 3, 1945.`

D. LEVKOFF FOLDING BOX Filed Deo` 22, 1942 2 Sheets-Sheet 1 INVENTOR.

Nl 7'NESS."

Jllly3,1945. D LEVKOFF A u 2,379,726

FOLDING Box Filed Deo. 22, 1942 2 Sheets-Sheet 2 76 I N VEN TOR.

Patented July 3, 1945 UNITED STATES PATENT O FFICE FGLDING BGX y David LevkoH, Brooklyn, N. Y.

Application December 22, 1942, Serial No. 469,796

l Claim.

This invention relates to improvements in foldingY cardboard boxes and more specifically to an end wall closure therefor.

One of the main features ofthe invention resides in a cardboard box which when in collapsed position consists of a fiat tubular body to facilitate compact stacking and shipping, and which has integral end wall structures which are foldable in a novel manner and glued, to seal and secure the box in set up position for use.

Another feature of the invention is to provideA an end closure for folding cardboard boxes in which all edges and corners between the side and end walls are closed by folds of the cardboard material to provide a seal to prevent leagake of the contents from the box and exclude moisture thereinto.

`Another feature of the invention is to provide a folding end wall structure which reinforces the end walls and end corners of a carboard box to reduce the loss of contents caused by breakage during handling and shipment.

A further feature of the invention is the provision of a folding box having the aforementioned features which-is formed from a single blank of cardboard of substantially rectangular configuration, and which may be cut from stock cardboard with a negligible amount of waste.

. Other features of the invention will become apparent as `the following speciflcationis read in conjunction with the accompanying drawings, in which: i

Figure 1 is an outside plan view of the blank of foldable material from which the box is constructed. i

Figure 2 is a perspective view of the box in parn tially folded collapsed position.

Figure 3 is a detail perspective view of one end Y of the box in a partially folded set up position.

Figure 4 is a detail perspective view of one end of the box just prior to the final folding and glu- .ins operation.

Figure 5 is a perspective view "of the box in sealed set up position.

Figure 6 is an enlarged detailed vertical trans verse sectional view on the line B- of Figure 5.

Figure 'l is a vertical sectional view on the line l-l of Figure 6.

Referring to the drawings by reference characters, the letter A in Figure 1 designates a sub stantially rectangular shaped blank of cardboard, heavy paper. or other like foldable material which is scored and folded in a novel manner to form a complete box having sealed end closures. The blank A isscored vertically on the suitably spaced parallel scores I0, II, I2, and I3. The blank is further scored on the horizontal lines IL-Iii which extend entirely across the blank. One side edge of the blank A, the score Iii and scores I4I,4 define a rectangular side wall panel i5. The scores I0, II, and I4I4 def-lne a larger rectangular side wall panel IB. The scores Il, I2. and I4I4 define a rectangular side wall panel Il which is complementary to the panel I5. The scores I2, i3 and Ill-I4 define a rectangular panel I8 which is complementary to the panel I8. The scores ill-I4, I3 and edge of the blank adjacent score I3 define a glue flap panel I8. Integrally connected to the ends of the panel It along the scores Id-II are inner end wall panels 2li- 20, the same also being bounded by the scores I2 and il. Theblank A is further scored on the horizontal scores 2I-2I, which scores are in alinement with the free end edges of the inner end wall panels 2li-20. The scores I4, 2l, I0, and ll at each end of the blank define a folding end Wall panel 22 of a size substantially the same as the panels 20, however, each panel 22 is divided in halves by a horizontal score 23 into foldable end panel sections 24 and 25. The scores 23 extend from the vertical `score I2, across the panels 22 to the free edge of the blank adjacent which the panel l5 is formed. Integrallyeonnected to the panel sections 25 along the scores 2I-2I are rectangular outer end wall panels .2 6-256 to which glue flaps 21--27 are connected along the end por= tions of 'the scores Illa and I I. The side wall panels I5 and i1 are divided in halfin a lengthwise direction by vertical scores 28-2B, which scores terminate at the ends of the scores 2 I-2 I. The scores 2B divide the narrow side wall panels I5 and Il into like folding sections 29 and 3Q to enable the flat folding of the sections one against the other when the box is in collapsedpositions as shown in Figure 2. The crossing scores I0, I4, 2| and one edge of the blank form the boundary for a square shaped fiap forming panel P and a similar nap forming panel P is bounded by the scores il, IQ, I2 and 2|. Each of the panels P-P are divided by the crossing scores 28 ,and 25 into four square folding sections a, b, c, and d. The sections a and b are further divided bydiagonal scores 3l and Sla respectively which scores meet atthe intersection of the scores 23 and i28 to pron vide a `triangular shaped glue fiap F. Whereas glue is not applied tothe flaps F until the blank has been folded to the position shown in Figure 4, I have stippled the drawing in Figure l to indicate those portions of the panel flaps P which re ceive glue prior to the final folding and sealing operation. It will be noted that a triangular shaped area of the sections c also receive glue, due to the fact that they are exposed to a gluing roller when the roller applies the glue to the triangular shaped naps F.

From the foregoing description of the blank A, it will be noted that the ends of all side wall panels have folding end closure panels integral with the ends thereof and that the endclosure panels 22, 20 and P-P at each end are integrally connected.

The initial folding of the blank A is upon the scores 28-28 to bring the complementary side wall panels I6 and I8 flat against each other, with the side wall panel section 29 of the panel I5 overlapping the glue side of the glue flap I9. The glue flap I9 may receive its glue fromA a gluing machine prior to folding of the blank on the scores ZIB- 28. rljhe glue ap I9 is diagonally scored adjacent its ends as at 32 for alinement with the scores 3| of the areas at the ends of the panel I5. With the blank A folded*y and gluedin the manner ju'st described, the box assumes a flat tubular.formationlasjillustrated .in Figure 2, and

the free infolding of the panels 22 and 20 to which 3 they are hingedly connected. v

Assume that the box is in the collapsed position shown in Figure 2, and it is desired to set up the same for use. An operator grasps the sides of the collapsed box and presses inwardly against the folds formed by the scores 28-28. This effects a separation of the opposed side wall panels l I6 and I8 and causes the folded panels I5 and I1 to spring into unfolded position at right angle to the panels I6 and I8. The side wall panels I5, I6, I1 and I8 are now in position with the end wall panels and flaps coextensive therewith. It will be understood that the bottom end wall structure is first folded to provide a bottom before the contents are placed in the box, after which the top end wall structure is folded and sealed. However, the folding and sealing of both end wall structures are the same so that a description of one will suffice for the other. With the body of the box set up, the operator may now press inwardly upon the-section 24 of the folding end wall panel 22 which causes the panel 22 to fold on the score 23. DurinT4 this operation, the glue flaps F are formed by the folding of the panel P on the diagonal scores 3I--3Io'l and that portion of the scores 28-28 dividing the sections c and d. Simultaneously the inner end wall panel 20 is drawn Vinwardly by hinging on the scores I4 and adjacent diagonal scores 2Ia as illustrated in Figure 3. The panel 20 is now pressed inwardly against the partially folded section 25 of the foldable end wall panel 22, until both the panel 20 and the panel section 25 assume a position at right angle to the side walls, at which time the section 25 is folded back against the inner folded section 213. The box now assumes the position shown in Figure 4 and is ready for its final gluing and subsequent folding and sealing operation. The pointed flaps F extend at right angle from the side panels I5 and I1 together with the sealstructure to form the-folded pointed sealing flaps F, triangular portions of the sections c are exposed for receiving glue when the inner sides of the flaps 21 and flaps F are passed over a glue roller. Immediately after receiving glue, the flaps 21 and F are simultaneously folded inwardly against the side wall panels I5 and I1 and become adhered thereto as illustrated in Figure 5. When both end wall structures are folded to closed position, the box appears as shown in Figure 5. To open the'box, the glued flaps 2l and triangular fold flaps F may be pulled loose from the side wall panels I5 and I1, whereupon the outer and inner end wall panels 26 and 20 may be pulled loose from their glue connection with the side wall panels I5 and I1 which frees the flap 26 and panels 2U and 22 for subsequent unfolding to open position. After an initial opening of the end wall structure to remove part of the contents of the box, theK structure may againbe folded to closed position and held by passing a rubberband about the box to lhold the naps 21 close to the side walls I5 and I1 as illustrated at B in dotted lines in Figure 5.

By reference to Figure l of the drawings, it will be noted that all side walls are .bounded at their ends by integral folding panel flaps, which when folded, provide a sealed box in which all edges' and corners are closed by folds in the material from which the box is constructed.

While I have shown and described what I consider to be the prepared embodiment of my invention, I wish it to be understood that such changes in construction .and design as come within the scope of the appended claim may be resorted to if desired without departing from the spirit of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

A folding box formed from a single blank of foldable material having four connected side walls, a folding end wall structure integri-1 with the four side walls comprising a folding end panel integral with and connected along a hinge score to one of said side walls, said folding end panel being scored parallel to the hinge score to divide the same into inner and outer folding sections, the inner section being folded inwardly and the outer section being folded outwardly and disposed over the inner section, an inner end wall panel ,integral with and connected by a hinge score to the .side wall opposite to that to which the folding end panel is connected and being folded over the outer section of the folded end panel, and an outer end wallpanel integral with the outer section and connected thereto along a hinge score, said outer end wall panel bting folded over the inner end wall panel, foldable flap forming panels integral with the other two opposed side walls and with the ends of the folding end panel and with the inner end wall panel and respectively connected thereto along hinge scores,'said foldable flap forming panels being respectively folded to provide foldable corner flaps, said corner flaps being folded against the last mentioned two opposed side walls and secured thereto by glueing, and side flaps 'connected to the ends of the outer end wall panel and being of a length greater than the folded corner flaps and respectively folded thereover with their end portions extending beyond the ends of the corner flaps and flatly engaging the last named side walls and being glued thereto.

DAVID LEVKOFF. 

